Global Polyester Polyols For Rigid Foam Market By Type (Vacuum Melting Method, Carrier Gas Melting Method, and Azeotropic Vapor Method), By Application (Aerospace Industry, Shipbuilding Industry, Petroleum Industry, Electronic Equipment, Automobile Industry, and Others), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029